FM ENQUEUE_READ for object EBAN

Hello everybody,

We want to check a certain purchase requisition with function module ENQUEUE_READ.
In transaction SM12 the argument is mandt + requ.nr + #####

Question: How do we have to fill parameter GARG to get a result?
Input without #### doesn’t work. Input with ##### doesn’t work either.
mandt + requ.nr + * works, but only when testing the FM, but not in a report.